Ok i have read plenty of articles suggesting what causes hole in head and nobody seems to know the actual causes. I have two oscars that have pits around their head & gill plates. I don't feed them feeder fish & I keep the water parameters pristine. I have put hole in head guard in which doesn't seem to do anything. I belive that it is only suposed to kill the parasite that causes it. I have now started soaking their food in nourish vitamin and amino acid supplement hoping this will cause them to start healing. They don't seem to be getting much worse but none of their wounds seem to be healing. Any ideas what will make them regenerate and prevent this from happening again? The oscars are the only thing in the tank that have an issue.